Coherent hyper-Raman scattering by autoionization states of atoms excited in the plasma of an electric discharge
Zheltikov A. M., Il'yasov O. S., Koroteev N. I.
A four-wave nonlinear-optics process has been detected under conditions corresponding to a hyper-Raman resonance with a transition between an autoionization state and a bound state of a copper atom. The Fano parameters are determined from the shape of the spectrum.